On Thu, Dec 01, 2011 at 03:39:43PM -0500, Daniel Manrique wrote:
>
> The ssleep(1); line is what appears to do the trick; the version that just
> queries the ID exhibits the same problem I reported initially, while the one
> that just ssleeps works fine, with the touchpad working OK after resuming.
>
> I'll await further instructions on this, thanks so much for your help!
>
OK, great. Could you please try the patch below to make sure it works as
intended and I'll queue it to upstream/stable?
Thanks.
--
Dmitry
Input: synaptics - fix touchpad not working after S2R on Vostro V13
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Synaptics touchpads on several Dell laptops, particularly Vostro V13
systems, may not respond properly to PS/2 commands and queries immediately
after resuming from suspend to RAM. This leads to unresponsive touchpad
after suspend/resume cycle.
Adding a 1-second delay after resetting the device allows touchpad to
finish initializing (calibrating?) and start reacting properly.
Reported-by: Daniel Manrique <daniel.manrique@xxxxxxxxxxxxx>
Tested-by: Daniel Manrique <daniel.manrique@xxxxxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dtor@xxxxxxx>
---
drivers/input/mouse/synaptics.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 06c9ee5..8081a0a 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -24,6 +24,7 @@
*/
#include <linux/module.h>
+#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
@@ -1288,6 +1289,16 @@ static int synaptics_reconnect(struct psmouse *psmouse)
do {
psmouse_reset(psmouse);
+ if (retry) {
+ /*
+ * On some boxes, right after resuming, the touchpad
+ * needs some time to finish initializing (I assume
+ * it needs time to calibrate) and start responding
+ * to Synaptics-specific queries, so let's wait a
+ * bit.
+ */
+ ssleep(1);
+ }
error = synaptics_detect(psmouse, 0);
} while (error && ++retry < 3);
--
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